William b



W. R. PATTERSON.

(No Model.)

TELEGRAPH CABLE.

Patented Feb. 3, 1885.

Ma/eww,

UNITED STATES PATENT OFFICE.

WILLIAM R. PATTERSON, OF CHICAGO, ILLINOIS, ASSIGNOB TO THE WESTERN ELECTRIC COMPANY, OF SAME PLACE.

TELEGRAPH-CABLE.

SPECIFICATION forming part of Letters Patent No. 311,521, dated February 3, 1885.

Application filed September 22, 1884. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM R. PATTER- soN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Telegraph-Cables, (Case 41,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specilication.

My invention relates to flexible telegraphcables in which a core of insulated conductors is drawn into a tube and protected by an insulating substance forced in hot among the conductors.

Heretofore lead pipes have been used in the manufacture of telegraph-cables; but cables having lead-pipe coverings are very heavy, especially for aerial uses. Rubber tubes have also been used to protect the cores of aerial cables; but no attempt has been made to lill the interstices among the conductors with an insulating substance for the purpose of preventing moisture from penetrating to the wires in case the tube proves defective, prior to my invention.

ln my application No. 134,333, (Case 332)/ filed June 9, 1883, of which this case is a division, I have claimed the method which consists in surrounding the core with an elastic pipe and forcing therein a melted insulating substance and allowing the insulating substance to cool within the elastic pipe.

My invention herein relates to the loose braiding or jacket which I place about the elastic tubes to preventthe internal pressure of the hot insulating substance as it is forced in from bursting the pipe.

My invention herein also relates to winding a serving about the jacket after the pipe has shrunk, so as to further strengthen the covering and prevent the pipe from expanding to any great extent in case the insulating substance should become warm or hot.

My invention is illustra-ted in the accompanying drawings, in which Figure 1 is a 1ongitudinal sectional View ofa telegraph-cable embodying my improvements. Fig. 2 is a transverse vertical section thereof.

The core a, may consist of any number of separately-insulated conductors. The tube b is ot' rubber or other elastic material. The jacket cis braided loosely about the pipe, so as to allow the pipe to expand only to a limited extent. As the paratne or other insulating material shrinks in cooling, the pipe also shrinks. After the pipe has shrunk l tightly wind about thejacket a serving, d, of strong tape or cord, thus strengthening the covering and holding'the jacket and pipe in place.

I claim- 1. The combination, with the rubber tube placed about the core of a telegraph-cable, of the paraftine filling,aud thejacket c, braided loosely about the pipe, whereby the expansion of the tube is limited, substantially as and for the purpose specified.

2. The combination, with the core of insulated iicxible wires, of an elastic tube, a filling of insulating substance, the loose jacket, and the strong serving about the jacket, closely Wound, as described.

3. The telegraph-cable which consists ofthe combination, with an elastic tube, of acore of insulated conductors and the paraiine lling, substantially as shown and described.

In witness whereof I hereunto subscribe my naine this 1st day of September, A. D. 1884.

VILLIAM It. PATTERSON.

Vitnesses:

GEORGE P. BARTON, HARRISON P. NIoHoLs. 

